Amazon, TikTok Shop and your own website: running three channels without undercutting yourself

Most brands we meet that sell on Amazon, TikTok Shop and their own website run them as one catalogue copied into three shops: the same products, the same prices, whatever stock happens to be where. Then they wonder why each channel’s report looks fine and the business isn’t making more money.

Three channels work when they are run as three jobs that share a warehouse and a brand. This guide covers the operating decisions that make that work: a role for each channel, pricing that doesn’t trip Amazon’s rules, how stock is shared, how to measure the effect one channel has on another, and how to judge each on profit. If you are still deciding which channel to start with, read our TikTok Shop vs Amazon guide first; it covers both channels’ fees, payouts and content costs. If TikTok Shop is new to you, start with how to sell on TikTok Shop in the UK.

Give each channel one job

The roles are ours, not anyone’s rules, and a brand with a strong retail or wholesale business will have a fourth row. What matters is that each channel has a reason to exist that the others don’t cover. If your website’s only role is to sell the same products as Amazon at the same price to the same people, it is costing you money to run.

The products should differ by channel too. The product that sells in a 20-second video is often not the one shoppers search for most on Amazon. Let video performance choose TikTok Shop’s hero and search data choose Amazon’s. They will disagree, and that is fine.

Pricing across channels

Prices don’t have to match across channels, but they can’t contradict each other, and on Amazon a contradiction has a direct cost.

Amazon looks at prices outside Amazon. Its Pricing Health page shows offers that are currently ineligible for the Featured Offer “because they aren’t priced competitively compared with other retailers outside of Amazon (the competitive external price) or they’re priced significantly higher than recent prices observed on Amazon or elsewhere"³. Lose the Featured Offer and shoppers can’t add your product to their basket from the main button; our guide to the Amazon Buy Box explains how it is chosen. Amazon doesn’t publish which outside prices it checks, so the safe assumption is that any public price, including your own website and a TikTok Shop flash sale, can count.

The Fair Pricing policy sets further limits. Amazon lists practices it says harm customer trust, including a misleading reference price, a price significantly higher than recent prices on or off Amazon, and “selling multiple units of a product for more per unit than that of a single unit of the same product"⁴. Breaches can lead to removal of the Featured Offer or the offer itself, and in serious or repeated cases suspension⁴.

In practice we use four rules, which are our practice and not Amazon’s:

1. Differentiate with packs, not discounts. A single unit on TikTok Shop for impulse buying, a multipack or refill on Amazon, a bundle with an extra item on your own site. Different products are not directly comparable, and the multipack still has to be cheaper per unit than the single.
2. Time promotions together. A deep discount on one channel becomes the external price Amazon compares against. If you run a TikTok Shop promotion on a product you also sell on Amazon, plan the Amazon price for the same days.
3. Keep your own site honest. A website price well above Amazon’s teaches loyal customers to buy on Amazon, where you pay fees on them. A website price well below Amazon’s can cost you the Featured Offer.
4. Control what you can. You set your own prices. You cannot require resellers to hold yours: in the UK that is resale price maintenance. Our guide to Amazon for manufacturers sets out what the law allows, including selective distribution.

Shared stock or ring-fenced stock

Three channels pulling on one pool of stock is where multichannel becomes an operations problem. Our inventory management playbook covers reorder points, cover bands and the allocation order we use (protect Amazon cover first, ring-fence stock for planned TikTok pushes, and use your own site as the flexible channel). The decision to make here is structural: share one pool through Amazon, or hold separate stock per channel.

Sharing through Multi-Channel Fulfilment. Amazon’s MCF “fulfils orders from outside of Amazon, including your own website”, using your FBA stock, through a quick order form, bulk upload or integrations with platforms such as Shopify¹. The details that matter for a multichannel brand¹:

• Packaging. MCF sellers are automatically enrolled in unbranded packaging at no additional fee, for sortable items up to 45.72 × 35.56 × 20.32 cm and 9 kg. Amazon says it “will aim to” ship eligible orders unbranded, and you can require it for a single order.
• Speed. Expedited delivery is one calendar day and Standard two to three, for standard-size sortable items to mainland UK. MCF does not ship UK orders abroad.
• Fees. MCF charges fulfilment fees; referral fees are not charged on MCF orders.
• Stock. For orders to ship on time, Amazon recommends in most cases at least eight weeks of cover or 100 units, whichever is greater, received and stored in a fulfilment centre.
• Risk. Reimbursement for a lost or damaged MCF unit is capped at £250, and MCF fees themselves are not reimbursable.

For TikTok Shop orders specifically, Amazon’s UK help describes a 12-month promotion from 16 July 2026 that cuts MCF outbound fulfilment fees by 35% for TikTok Shop orders submitted through a supported integration that identifies the channel; manually created orders don’t qualify. The same page also refers to orders in the United States, so confirm eligibility in your own account². Check TikTok Shop’s own UK fulfilment rules before you route its orders this way.

Ring-fencing. Separate stock for Amazon, TikTok Shop and your own site (in your warehouse or a third-party one) ties up more cash and risks stock in the wrong place, but no single limit or outage stops every channel at once. Most brands we work with land between the two: FBA as the main pool, MCF for website orders, and a ring-fenced buffer before a planned TikTok push so a viral week can’t drain Amazon cover.

Measure the halo honestly

Every channel’s dashboard claims what it can see and misses what it can’t. TikTok Shop’s reports count sales in the app. Amazon’s ad reports credit a sale to an ad only within an attribution window after a click, seven days for sellers’ Sponsored Products⁸. Neither will show you a shopper who watched a video on Tuesday and searched for your brand on Amazon on Friday. We have seen that pattern in accounts we manage, and described one case in our TikTok Shop vs Amazon guide, but an observation is not a measurement.

To measure it, you need three Amazon numbers and a comparison:

• Branded search demand. The Search Query Performance dashboard in Brand Analytics shows query volume, impressions, clicks, basket adds and purchases for searches related to your brand, weekly, monthly or quarterly⁵. Branded query volume is the closest thing to a direct reading of demand created elsewhere.
• Sessions and total sales. From the Business Report: sessions (visits to your product pages in a 24-hour period) and Ordered Product Sales⁷.
• Tagged links, where you control the link. Amazon Attribution is free, available in the UK to professional sellers in Brand Registry, and reports clicks, detail page views, basket adds and purchases from links you place outside Amazon⁶. It measures the shoppers who click; it can’t see the ones who search instead.

Judge each channel on profit

Once you can estimate the halo, report each channel on contribution, after every cost that channel causes:

The last line is the one most often missing. On TikTok Shop, creator commission, free samples and the cost of making video every week are the cost of the channel, and our TikTok Shop vs Amazon guide shows how they compare with Amazon’s fees. On your own site, payment fees, delivery and the paid traffic you buy belong in the same sum. For the Amazon column, our guide to Amazon selling fees in the UK lists every platform and fulfilment fee, and the FBA calculator for the UK works them out per unit.

Then report the halo separately, not merged into TikTok’s figures. A one-page monthly view we use:

Keeping the halo in its own column stops two opposite mistakes: cutting TikTok because its in-app contribution looks thin, and keeping a loss-making TikTok programme because “it helps Amazon” without anyone having checked. Our break-even ACoS guide shows how to work out the Amazon margin that goes into the sum.

Keep three channels’ product data in step

Three channels means every product change must land in three places, each with its own listing rules. A new pack size, an ingredient change, a safety warning: if it reaches Amazon but not TikTok Shop, or your site but not Amazon, you have three versions of the truth and a compliance risk on at least one. Keep one master copy of product data outside every platform and publish from it, as our guide to running a complex Amazon account describes. Multichannel multiplies whatever discipline you already have on Amazon, good or bad.

When to add a channel, and when not to

Add a channel when the existing ones are profitable and run without the founder doing everything, when you can staff its particular work (weekly video for TikTok Shop, customer service and traffic for your own site), and when you can measure what it adds. Hold off when stock is already tight, when one channel’s prices would undercut another’s, or when nobody owns the product data. Three channels done properly will usually beat one; three channels done by default usually just mean three sets of fees on the same customers. The same test applies to any further marketplace, such as Tesco Marketplace.